Muffler for explosive-engines.



PATENTED APR. 23, 1907.

W. M. BRISBEN. MUPFLER FOR EXPLOSIVB ENGINES.

APPLICATION FILED JAN. B, 1907.

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'rana Enron mg 1s aspeciiication. v 4 My invention has relationto mulers for explosive engines. and particularly ior autoZ mobile engines although adapted for launch andother engines to which it is desired to ap ly a muHier. A t

he object of my invention is, gem-irally,

to provide a mu'iilercf such construction and arrangement of parts that the gases from the engine will, while being exhausted directly .into the air. beso controlled and modified metal provided in physical character that the noise usually incident to the exhaust will .be subdued to a Aminimum without retardation of their escape or the imposition of back. pressure on the piston of the engine.

My invention consists -in the .novel construction combination and arrangement of parts hereinafter described and claimed.

1 have illustrated my improvements in the accompanying drawing in which: l

Figure 1, is a vertical longitudinal sectional view of a muflier constructed according to my invention. sectional view on the line X-X of Fig. 1, Figs. 3 and 4 are sectional views of parts of the mufiler.

The body of my improved inuiiler is coruposed of an inner cylindrical section of perforated sheet metal 1, and au outer cylindrical section of perforated sheet metal 2, each of the same. or approximately the same length .and of such proportionate diameter' that when arranged 1n their properrelative positions an annular space will be lel't between them of a wid th sullicient to permit of the proper expansion of the gases being discharged through the muiiier as willbe hereinafter described.

The perforated sheet metal of which the sections 1 and 2 are composed is a well known article of eommerce'and need not therefore be particularly to say that it is comparatively thin sheetthroughout its entire extent with regularly disposed circular holes of uniform size disposed at adistance apart' about equal to their diameter and varying in Speeiiction of -Letters Patent. l pplination led January .8, 1907. Serial No. 8161.352.

Fig. 2 is a vertical transverse described, it being suilicient` 31M. BRrsBEN, .or?n'Acmlxisacx',A NEW JERSEY;

muFFLe-n Fon ExPLosivE-ENGINEYS.

'Patentednp'rn as, 1907.

size in different sheets, according to thepurpose for which the sheet is to be used.

In the drawing the holes in section 1, are

designated land those insection 2 are designated 2 and these holes, it 'will be seen are disposed at regular intervals throughout the entire extent of each section. l

At the opposite ends of the sections 1, 2, are heads designated respectively 3 and 4, these heads being rabbeted' to receive the edgeslof-the sections 1 and 2, and the sections being secured in position by bolts 4' which pass through the sections near their edges and`through the heads 3, 4, as shown in Fig. 1. The head 3, is provided with a central opening 5 in which 1s 'ixed a perfor `rated disl; 6, while the head 4, is provided with a;v central opening 7 in which is n'xed the connection for the exhaust pipe of the engine.

This connection is of peculiar and novel form and as shown is composed of Va plurality of sections of pipe 8, 9, 10, which are screw-A jointed one into the'other and are of suc-v cessively increasing size from the exhaust pipe -to the head 4, the exhaust being designated 11 and being the section 8 of the connection nary nipple A12.

' en my improved muffler is used on an automobile and in order to protect the body of the automobile from the deleterious action of escaping gases, I provide a hood 13, of sheet metal which is arranged concentric to pipeproper coupled to by an ordithe outer section 2 and attached to brackets 14, 15 respectively mounted on the periph- ,.eries of the heads 3, 4. The hood 13 is of greater length than the section 2 and extends longitudinally beyond both the heads 3, 4 and is formed at its forward end, that is the end nearest the engine, with a bell 16. The hood 13 is somewhat largerA in diameter than the section 2 so vas to leave a space therebetween, and a current of air is created in this space 4by the forward movement oi' the automobile and this current ol air serves to drive to the rear of the hood the heated gases emerging through the perforations in section 2, and thus prevent these gases from coming into contact with the'bodyof the automobile.

Operation. The hot gases coming from the engine through the. exhaust pipe 11 pass first through the connection composed of the sections 8, 9, 10 and as these sections are of successively increasing size, the gases expand lOO and -lose seine of their expansive force in npassin therethrough.` The gases then pass throug the opening 7 in head 4 and into section 1 in which they expand and then vass 5 through the holes 1 into section'2, in W ich they expand lstill further and from which they finally emerge through the holes 2 and when the hood 1.5 is employed, are carried by the current of air passing between the hood roand the outer section to the rear end of the hood Where they are discharged into the open air. Some of the gas ex anding as before described'l in section 1, wi l of course escape through t'he perforated disc 6, but by the r time such portion of the gases has reached this disk it will have expanded to such an 4extent as to pass noiselcssly into the open air. The greater part of the gases however emerge after their partial expaiiisionl in sec- 2o tion l, and as before described, through the holes 1 into the section 2 and thence after further expansion escape into the air outside section 2 through the holes 2. By reason of the fact vthat the sections 1 and 2 are perfo- 2 5 rated throughout their cntirc'extent both of length and circumference, there is practically no obstruction-to such expansion' and certainly no obstruction suflicicnt to produce a noticeable amountl of back pressure in the 3o engine. At the Sametime the sections 1, 2, cufliciently retard the expansion o'l the gases to prevent their expanding in a sudden and explosive manner and therefore the noise which always accompanies the discharge 3 5 into the open air of highly compressed gases is eliminated.

I claim: V l 1. In a muffler, the combination of two l concentric cylindrical sections each perfo-l 4o rated throughout its entire length and circumference, the outer section being exposed to the outer air heads to which such sections are secured and an inlet connection entering the center of one of said heads.4

2. In a muffler, the combination of two concentric cylindrical sections each perfo rated throughout its entire length and,circulmference, the outer section being exposed to the outer air heads to which said sections are secured, an inlet connection entering one 5o of said heads and a hood openat both-'ends surrounding the outer section and.v spaced apart from the same. i I A 3. lny 'a muffler the combination of. two concentric perforated cylindrical sections, heads to which said sections are secured and an inlet connection entering bnc of Said heads, said connection being of gradually increasing size 'from its engine end toits muffier end.

4. in a inuliler, the .combination with a' plurality of concentric perforated cylindrical j sections, heads on which said sections are mounted, one of said headsl beingl provided .with a central opening, of a connection adapted to be coupled to the exhaust pipe of an engine, said connection consisting of a plurality of coupled sections of pipe oiA dilerent size. I

5. In a muffler, the combination with a 7o plurality o1 concentric: perforated cylindrical sections, heads on which said sections are mounted, oi." a connection leading to the in? lterior ot the inner section, brackets carried by said heads and a cylindrical bell mouthed hood attached to said brackets and surrounding the outer section. g

In testimony whereof I atlix my signature, in presence of two Witnesses.

f WILLIAM M. BRISBEN.

VVit-nesses i WARNER .W. WEs'rERvELT, Jr., FLOYD Vl'AsnBURN. 

